Sorry Callum, I didn't have time (or sufficiently derogatory vocabulary) to use a more appropriate description. However, I hadn't realised they had improved that much since I had my battle with them - disinformation sounds like a few steps up from uninterested.
Unfortunately, grateful as I am for all their assistance, for some reason I didn't take up their very generous offer to allow me to download the 1:50K version at the special full price of c.£200, provided that I'd accept no refund whatsoever on return of the card purchased in error (if indeed it was in error & not just my wilful disregard to the unstated details warning me of the mode of protection used) .
Needless to say after such superb consideration for customer relations, I would not condone use of anything that might mean I could obtain the functionality I'm looking for, and also enable an effective backup in the process, However, I feel it is my duty to confirm if this is indeed possible .
....Callum, can you mail me the details please